Free tool
Clipping & noise detector
Drop in a recording and get one report: where it clips and for how long, its true peak against its sample peak, the noise floor, any mains hum, and whether the waveform is centred.
Drop an audio file, or choose one. It's read on this device and never sent anywhere.
If it found something
Detection names the defect; restoration treats it
One contextual next step, offered after your result — never in front of it.
Every finding on this page maps to a specific repair: declipping reconstructs the flattened peaks, hum removal takes out the tone series and leaves the programme, and broadband noise is reduced against a measured floor rather than a guess. Euphona’s audio restoration builds that defect map itself and treats each problem with the tool that suits it — the free plan runs it on your own recording, level-matched against the original.
The findings
What each finding means
Five different defects, five different fixes — which is the point of telling them apart.
Clipping is what happens when a waveform is pushed past the loudest value the format can store: the peaks are simply cut off flat, and the cut edges are heard as distortion. It's detected by looking for runs of samples parked at the ceiling — a waveform touches its peak and leaves; a wall of identical samples was put there by an overload.
- True peak vs sample peak
- A file can peak at −0.4 dBFS on every sample and still swing above 0 dB between samples — which is what a lossy encoder has to reproduce, and where it distorts. That gap is why the report shows both numbers, and why streaming ceilings are stated in dBTP rather than dBFS.
- Noise floor, not noise level
- The floor is the level the recording falls to when nothing is playing — hiss, room, preamp. It's read from the file’s quiet passages when it has them; when it never goes quiet, the figure is the quietest sustained level and the report says so rather than presenting a guess as a measurement.
- Mains hum
- Electrical interference at 50 or 60 Hz with harmonics stacked above it. The harmonic family is what separates hum from a bass note that happens to sit near the mains frequency — a single prominent tone at 55 Hz is music; a series at 50, 100 and 150 Hz is wiring.
- Clipping that hides below full scale
- A file clipped and then turned down keeps its flat tops at a ceiling under 0 dBFS. The detector looks for exactly-flat runs there — a shape a sampled waveform doesn't produce on its own — and reports the finding with that hedge attached, because the evidence is one step more circumstantial.
Verification
How to check this tool
Checked on every build against constructed signals: a sine hard-clipped at full scale is found and mapped, the same clip attenuated afterwards is found and hedged, and a clean loud sub-bass sine — the case that fools threshold-only detectors — is not flagged. True peak uses the same 4×-oversampled measurement as the loudness checker. What this page doesn't do is repair anything: detection is free because measuring is cheap; reconstruction is the engine’s job.